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DTC P0441: EVAP Purge Flow Monitor: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP is displayed and equal to zero, go to next step. If GOOD TRIP is not displayed and equal to zero, go to step  8 .
  2. Visually inspect EVAP canister for physical damage or signs or fuel entering canister. See Fig 1 . Signs of fuel may indicate a defective rollover valve. If a problem is found, repair as necessary. If no problems are found, go to next step.
  3. Visually inspect EVAP purge hose between EVAP canister and fuel tank for physical damage. Repair or replace hose as necessary. If hose is okay, go to next step.
  4. Visually inspect EVAP purge hose between EVAP canister and purge solenoid for physical damage. See Fig 2 . Repair or replace hose as necessary. If hose is okay, go to next step.
  5. Check EVAP purge solenoid vacuum supply hose for proper routing. Also, check hose for blockage or leak. Check vacuum supply nipple on throttle for damage or blockage. If a problem is found, repair as necessary. If no problems are found, go to next step.
  6. Ensure ignition is off. Disconnect vacuum supply hose from EVAP purge solenoid. Using a hand vacuum pump, apply 10 in. Hg of vacuum to EVAP purge solenoid vacuum hose port. If EVAP purge solenoid holds vacuum, go to next step. If EVAP purge solenoid does not hold vacuum, replace EVAP purge solenoid.
  7. Ensure 10 in. Hg of vacuum is still applied to EVAP purge solenoid. Turn ignition on. Using scan tool, actuate EVAP purge solenoid. If vacuum drops when EVAP purge solenoid is actuated, test is complete. If vacuum does not drop when EVAP purge solenoid is actuated, replace EVAP purge solenoid.
  8. Conditions that set DTC are not present at this time. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins (TSBs) that may apply. Perform a wiggle test on EVAP purge solenoid wiring while circuit is actuated with scan tool. Feel for solenoid to stop actuating. Also, watch for GOOD TRIP counter to change to zero. If a problem is found, repair as necessary. If no problems are found, test is complete.
Fig 1: Locating EVAP Canister & Leak Detection Pump
G00030284Courtesy of DAIMLERCHRYSLER CORPORATION
Fig 2: Locating EVAP Purge Solenoid & Power Steering Pressure Switch
G00030270Courtesy of DAIMLERCHRYSLER CORPORATION
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